High temperature alloy



Patented Oct. 11, 1960 In Table I there is listed a series of alloys of the present invention which were subjected to various tests listed 2 9 34 below: I

e Table I HIGH TEMPERATURE ALLOY I Charles H. Emery, Lockport, N.Y., assignor to Simonds A1101 0 Si M11 Ni of M0 W S aw and Steel Company, Fitchbnrg, Mass., a corpora- Massachusetts l3? 14:33 32:23 3:33 513%" No Drawing. Filed June 12, 1959, Ser. No. 819,838 52 13: 33

3C] (Cl 1 17 45.19 25 23 2.89 3

Test samples were made of the above alloys of the present invention, the ultimate analysis of which is shown The present mventlon relates to so-called g p above in Table I, and the samples subjected to the usual alleys and partielllal'ly t0 Wrought alloys for use in mechanical strength tests to determine the ultimate tensile fabricating mechanical structures subjected to operating t h expressed i pgunds per square i h, r t 6101p temperatures above 1500" and generally at P gation in two inches and the percent reduction in area tures in the range 1700 F. to 2200 F. at rupture. Table II shows these data obtained upon the The alloys of the present invention, in addition to bo samples t 1800 F, d T ble III, t 195() F, resistance to high temperature without substantial distortion and loss of mechanical strength, must withstand Table H the action of various atmospheres tending chemically [Tested in 13W F J to degrade the alloys including oxidizing atmospheres, re- U ducing atmospheres and carburizing atmospheres, and 25 51mm Elengetilm, Reduction changes from one to the other, including so-called neu- Alloy fiiil g m P255313, tral atmospheres.

Further, the alloys of the present invention, under 15,900 as the physical and chemical environment mentioned above, 288 3, 3% withstands usual corrosive influences encountered at the 16: 700 36 high temperature such as the action of oxygen and acidic 17,100 40 36 materials generally found associated with products of combustion of the usual solid, liquid and gaseous fuels, Table 111 and more importantly, these alloys resist excessive absorpt d a 5 11 tion of elements as for instance carbon, which would 35 result in deterioration of the inherent characteristic of Ultimate Elongation, Reduction the alloy to carry high loads at high temperature and Strength Dementia Are,

p.s.1. 2 1n. Percent to resist high temperature deformation.

A particular advantage of the alloys of the present 10 600 49 38 invention resides in the fact that in ultimate use, the 111300 35 alloy may be and preferably is employed in the wrought 8 i? condition rather than as a casting, since such alloys possess 10: 000 46 36 hot ductility and can therefore be worked in various mill fOImS- In addition, the alloys of the Present lnven Weighed samples of the alloys of Table I were subjected t1"311 Possess Sllfllclent cold ductility to Permit cold form 45 to 25 cycles of heating in air to 2150 F. with a 2-hour hold at that temperature and subsequent quenching in The various objectives, advantages and characteristics il Aft 25 cycles of hi treatment the specimens are Present in the improved alloys Within the broad were descaled and weighed and, from the loss in weight, Position limit as follows! nickel, 35% to 55 chromium, this determined calculation made for corrosion expressed 15% t0 and less than 5% each of molybdenum 50 in the usual manner as inches penetration per month. and tungsten, either combined or separately; less than 5% cobalt, with silicon, carbon and manganese not ex- Table IV ceeding 1.75%, 0.20% and 2.0%, respectively, the re- [2503101650f0xidati0nat2150FJ mainder being essentially iron.

It is believed that the general level of resistance to Inches P n corrosion and carburization are probably established by Alloy $335 the nickel-chromium content and relationship, and that the silicon enhances the two resistance characteristics A mentioned, and probably in part, regulates the char- B 11063 acteristic forgeability of the alloy. 18822 In considering the overall properties of the alloy, E -0064 it is felt that molybdenum and tungsten, either separately or in combination, contribute primarily to the high tem- Although broad limits of alloying constituents have perature strength of the alloy by reason of the formabeen given above, in accordance with the present invention of temperature-stable carbide complexes and solid tion, a preferred, somewhat narrower range of alloying solution strengthening of the matrix of the alloy. constituents is as follows: Ni-42% to 50%; chromium- It is further believed that both tungsten and molyb- 0% 0 30%, With molybdenum up to 6%; tungsten-up denum augment corrosion resistance, particularly oxidato 6%, whether used separately or in combination; cotion resistance, with tungsten appearing to be somewhat balt--up to 5%, the alloy requiring an alloying consuperior in this respect. It is believed that the presence stituent selected from the group consisting of molybof cobalt is advantageous and, by reason of its solubility denum and tungsten, and generally relatively low carbon in the matrix, contributes to solid solution strengthening. in the neighborhood of 0.10%, and silicon not exceeding being essentially iron.

What is claimed is:

1. An alloy containing nickel in the range, 42% to 50%; chromium in the range 20% to 30%; an alloying constituent selected from the group consisting of tungsten and molybdenum each constituent not exceeding 6%; cobalt not exceeding with silicon, carbon and manganese not exceeding 1.75%, 0.20%, and 2.0%, respectively, the remainder being essentiallyriron.

2. An alloy containing nickel in the range 35% to 55%; chromium in the range to about 3% each of molybdenum, tungsten and cobalt; with silicon, carbon and'manganese not exceeding 1.75%, 0.20%, and

2.0%, respectively, the remainder being essentially iron.

3. An alloy containing nickel in the range to r chromium in the range 15% to 30%; about 3% each of molybdenum and tungsten; With silicon, carbon and manganese not exceeding 1.75%, 0.20%, and 2.0%, respectively, the remainder being essentially iron.

References Cited the file'oi tiat ent 

2. AN ALLOY CONTAINING NICKEL IN THE RANGE 35% TO 55%, CHROMIUM IN THE RANGE 15% TO 30%, ABOUT 3% EACH OF MOLYBDENUM, TUNGSTEN AND COBALT, WITH SILICON, CARBON AND MANGANESE NOT EXCEEDING 1.75%, 0.20%, AND 2.0%, RESPECTIVELY, THE REMAINDER BEING ESSENTIALLY IRON. 